Author and radio talk show host Zola Levitt will discuss the biblical signs that suggest Armageddon is near. Zola, known as an expert in biblical prophecy, speaks at the Calvary Chapel of Salt Lake City, 7136 S. 1700 East, at 6 p.m. Saturday and 9 a.m., 11 a.m. and 6:30 p.m. on Sunday.